Propeller



May 28, 1935. f-s, FAB R 2,003,073

PROPELLER Filed Aug. 8, 1930.

Patented May 28, 1935 NT OFFICE PROPELLER Guy's. Faber, Chicago, Ill., assignor to- General Regulator Corporation, Chicago, 111., a corp o ration of Illinois Application August 8, 1930, Serial No. 473,988

15 Claims.

My invention relates topropellers formed of v blades radiatingfrom the axis of the. device, as for example in the case of fans for creating a flow of air, or agitators.

My object generally stated is to provide a construction of propeller which will operate with greater efliciency than devices as hitherto provided to the end that a propeller of given size will exert a much greater propelling force than heretofore, and in the case more particularly of its use as an air fan, will produce a greater flow of air than in the use of, structures as hitherto provided; thereby permitting of the use of a propeller of smaller size and operated by a power device consuming less energy than in the case of prior structures.

Referring to the accompanying drawing:

Figure 1 is a face view of one form of propeller constructed in accordance with my invention.,

Figure 2 is an edge view of the same. I

Figure 3 is an, enlarged sectional view taken through one of the similar blades of the propeller, the section being taken at the line 3 on Fig. 1 and viewed in the direction of the arrow;

and

Figure 4, a view like Fig. 3 of a modified form of the invention.

Referring to the particular embodiment of my inventionillustrated in Figs. 1, 2 and 3, the propeller shown is of the substantially radial fourbladed -type,'though the invention may be embodied in a propeller the number of blades of which is greater or less than shown.

The blades 4 of the propeller are inclined, or

' pitched, at an angle to their plane of rotation in the-usual manner. The shaft by which' the propeller is driven is represented at 5 and the blades extend outwardly at right anglesto the shaft as shown in Fig. 2. As shown in Fig.1 the major portion of each blade and the slot therein lies to the rear of. the direction of rotation of the line radial to the shaft axis which is common to the two opposite blades.

Each blade 4 preferably, and as shown, slightly tapers from its end adjacent the center of the propeller to its outer extremity as shown, the taper being such that the propelling action of the blade throughout substantially its entire length is substantially uniformlyeffective,

whereby the fluid being operated on by the propeller is forced therefrom in a substantially solid column in which the fluid throughout its cross section moves at substantially the sam velocity.

wise thereof and are provided with deflecting surfaces so disposed that the fluid displaced by the blades is deflected more or less sharply in a forward direction adjacent the slots 6 to create suction action at the slots. These deflecting surfaces represented at 1 and 8 are preferably formed by deflecting forwardly the metal at those edges of the slots 6 which are the forward ones of theiropposite edges considering the direction of rotation of the fan as represented by the arrow 8 in Figs. 1 and 2 and the metal beyond these slots the forward faces of the deflected portions 1 and 8 preferably being of curved shape as shown.

The result of providing the slots 6 as stated and the deflecting surfaces 1 and 8 is to cause a great degree of suction to be produced at the slots which action on the fluid at the rear. of the fan produces a marked flow of fluid from the rear to the front of the fan through the openings in'the blades.

Each deflecting surface 1 and 8 functions in the production of the suction action at the slots 5 and while each-blade is preferably provided with both surfaces 7 and B as stated, I do'not invention thereto as either one of these-defiect ing surfaces -may be dispensed with, with;

accompanying decrease in the efficiency of the device without departing from my invention.

Under some conditions itmj i fiy be' as in the case of the i'slots. 6 and in more or less parallel relation to each other; In Fig. 4 'I have illustrated, by a cross-sectional view, a blade having two such slots represented at Band III, though it will *be' understood that the-number thereof may be increased if desired, with a for- Wardly extending curved deflecting surface ll extending substantiallylentirely along the advance edge of the slot 9; a substantially similar I sirable to 7 provide each blade with aplu'rality of slots extending generally lengthwise" of the blade preferably substantially the entire length thereof wish to be understood as intending to limit my 1 the case of the use of either or both of the sur-v faces II and".

While I have illustrated anddescribed certain particular embodiments of my invention, I do not wish to be understood as intending to limit it thereto as the same may be variously modified and altered without departing from the spirit of my invention.

What I claim as new, and desire to secure by Letters Patent, is:

1. A propeller the blades of which contain openings therethrough, each of said blades having a forwardly-extending, deflector surface adjacent an edge of the opening therein operative to produce suction at said opening.

2. A propeller the blades of which contain openings therethrough, each of said blades having a forwardly-extending, deflector surface adjacent the advance edge of the opening therein and operative to produce suction at saidopening.

3. A propeller the blades of which contain openings therethrough, each of said blades having a forwardly-extending, deflector surface extending in front of and beyond the opening therein operative to produce suction at said opening.

4. A propeller the blades of which contain openings therethrough, each of said blades having a forwardly extending curved deflector surface adjacent an edge of the opening therein operative to produce suction at said opening.

5. A propeller the blades of which contain openings therethrough, each of said blades having a forwardly extending curved deflector surface adjacent the advance edge of the opening therein operative to produce suction at said opening.

6. A propeller the blades of which containing openings therethrough, each of said blades having a forwardly extending curved deflector surface extending in front of and beyond the opening therein operative to produce suction at said opening.

'7. A propeller the blades of which contain openings therethrough, each of said blades having forwardly extending deflector surfaces located at opposite sides of the plane of the opening therein operative to produce suction at said opening.

8. A propeller the blades of which contain openings therethrough, each of said blades having forwardly extending curved deflector surand extending forwardly beyond the rear edge of the opening and operative to produce suction at said opening.

10. A propeller the blades of which conta slots extending lengthwise thereof, said slots being located closer to the trailingedges of the blades than to their leading edges and said blades being. so shaped as to create suction toward the rear of the propeller through said slots in the rotation of the propeller.

11. A propeller the blades of which contain openings therethrough, said blades having forwardly-extending deflector surfaces adjacent the leading edges of said openings operative'to produce suction at said openings, the major portions of said blades and the openings therein lying to the rear of the direction of rotation of the line radial to the shaft axis which is common to the opposite blades, said blades being so shaped as to create suction toward the rear of the propeller through said openings in the rotation of the propeller.

12. A propeller each blade of which contains a plurality of openings therethrough disposed in different positions in a direction crosswise of the blade, said blades having forwardly extending deflector surfaces adjacent the leading edges of said openings and operative to produce suction at said openings.

13. A propeller the blades of which contain slots extending lengthwise of the blades but to the rear of the direction of rotation of the line radial to the shaft axis whichis common to the two opposite blades, said blades having forwardly extending deflector surfaces adjacent the leading edges of said slots operative to produce suction at said slots.

14. A propeller the blades of which contain slots extending lengthwise of the blades but to the rear of the direction of rotation of the line radial to the shaft axis which is common to the two opposite blades and substantially parallel with said axis, said 'blades having forwardly extending deflector surfaces adjacent the leading edges of said slots operative to produce suction 

